A quick heads-up for anyone using WP Rocket: before updating to WordPress 7.1, make sure WP Rocket is updated to version 3.23.2.2 or newer.
WP Rocket confirmed that older versions can conflict with changes in WordPress 7.1 in certain configurations, potentially making both the frontend and wp-admin inaccessible.
So the safe update order is simple: WP Rocket first, WordPress 7.1 second.
Worth checking before hitting that update button.